diff --git a/qtile_extras/widget/groupbox2.py b/qtile_extras/widget/groupbox2.py
index 46c6120b..20c46bff 100644
--- a/qtile_extras/widget/groupbox2.py
+++ b/qtile_extras/widget/groupbox2.py
@@ -19,6 +19,7 @@
 # SOFTWARE.
 from __future__ import annotations
 
+import math
 from copy import deepcopy
 from enum import Flag, auto
 from typing import TYPE_CHECKING
@@ -60,12 +61,24 @@ def filter_attrs(attr):
 
 
 class GroupBoxRule:
+    attrs = [
+        "text_colour",
+        "block_colour",
+        "block_border_width",
+        "block_border_colour",
+        "block_corner_radius",
+        "line_width",
+        "line_colour",
+        "text",
+    ]
+
     def __init__(
         self,
         text_colour=SENTINEL,
         block_colour=SENTINEL,
         block_border_width=SENTINEL,
         block_border_colour=SENTINEL,
+        block_corner_radius=SENTINEL,
         line_width=SENTINEL,
         line_colour=SENTINEL,
         text=SENTINEL,
@@ -74,6 +87,7 @@ def __init__(
         self.block_colour = block_colour
         self.block_border_width = block_border_width
         self.block_border_colour = block_border_colour
+        self.block_corner_radius = block_corner_radius
         self.line_width = line_width
         self.line_colour = line_colour
         self.text = text
@@ -140,9 +154,7 @@ def clone(self):
         return deepcopy(self)
 
     def __repr__(self):
-        output = describe_attributes(
-            self, ["text_colour", "block_colour", "block_border_width", "block_border_colour"]
-        )
+        output = describe_attributes(self, GroupBoxRule.attrs)
         when = describe_attributes(
             self, ["screen", "focused", "occupied", "urgent", "group_name", "func"], filter_attrs
         )
@@ -224,15 +236,7 @@ def _set_formats(self):
 
     @property
     def rule_attrs(self):
-        return [
-            "text_colour",
-            "block_colour",
-            "block_border_width",
-            "block_border_colour",
-            "line_colour",
-            "line_width",
-            "text",
-        ]
+        return GroupBoxRule.attrs
 
     def _reset_format(self):
         for attr in self.rule_attrs:
@@ -266,16 +270,39 @@ def has_line(self):
 
     def draw_block(self):
         ctx = self.drawer.ctx
-        ctx.rectangle(
-            self.margin_x,
-            self.margin_y,
-            self.size - 2 * self.margin_x,
-            self.bar.height - 2 * self.margin_y,
-        )
+        if not self.block_corner_radius:
+            ctx.rectangle(
+                self.margin_x,
+                self.margin_y,
+                self.size - 2 * self.margin_x,
+                self.bar.height - 2 * self.margin_y,
+            )
+        else:
+            radius = self.block_corner_radius
+            degrees = math.pi / 180.0
+
+            ctx.new_sub_path()
+
+            delta = radius + 1
+            x = self.margin_x
+            y = self.margin_y
+            width = self.size - 2 * self.margin_x
+            height = self.bar.height - 2 * self.margin_y
+            ctx.arc(x + width - delta, y + delta, radius, -90 * degrees, 0 * degrees)
+            ctx.arc(x + width - delta, y + height - delta, radius, 0 * degrees, 90 * degrees)
+            ctx.arc(x + delta, y + height - delta, radius, 90 * degrees, 180 * degrees)
+            ctx.arc(x + delta, y + delta, radius, 180 * degrees, 270 * degrees)
+            ctx.close_path()
+
         if self.block_colour:
             self.drawer.set_source_rgb(self.block_colour)
             ctx.fill_preserve()
 
+        if self.block_border_colour and self.block_border_width:
+            ctx.set_line_width(self.block_border_width)
+            self.drawer.set_source_rgb(self.block_border_colour)
+            ctx.stroke()
+
         ctx.new_path()
 
     def draw_text(self):
@@ -337,6 +364,8 @@ class GroupBox2(base._Widget, base.MarginMixin, base.PaddingMixin):
 
     For example:
 
+    .. code:: python
+
         rules = [
             GroupBoxRule(block_colour="009999").when(screen=ScreenRule.THIS),
             GroupBoxRule(block_colour="999999").when(occupied=True),
@@ -360,6 +389,8 @@ class GroupBox2(base._Widget, base.MarginMixin, base.PaddingMixin):
 
     As an example, to create a rule that is matched when a specific app is open in the group:
 
+    .. code:: python
+
         def has_vlc(rule, box):
             for win in box.group.windows:
                 if "VLC" in win.name:
@@ -374,6 +405,8 @@ def has_vlc(rule, box):
     In addition, a user-defined function can set display properties dynamically. For example, to have a different icon
     depending on the state of the group:
 
+    .. code:: python
+
         def set_label(rule, box):
             if box.focused:
                 rule.text = "◉"
@@ -387,6 +420,7 @@ def set_label(rule, box):
         # Include this in your group box rules
         # NB: The function returns True so this rule will always be run
         GroupBoxRule().when(func=set_label)
+
     """
 
     _experimental = True